31.If the angle between the lines whose ...

31.If the angle between the lines whose direction ratios are 2,-1,2 and a,3,5 be `45^@`, then a =(A) 1(B) 2(C) 3(D) 4

A

1

B

2

C

3

D

4

Verified by Experts

The correct Answer is:

D

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